iota-editor 0.1.0

A simple text editor
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use keyboard::Key;
use keymap::{KeyMap, KeyMapState};
use command::{Builder, BuilderEvent, Command};

use super::{Mode, ModeType};


/// NormalMode mimics Vi's Normal mode.
pub struct NormalMode {
    keymap: KeyMap<Command>,
    builder: Builder,
}

impl NormalMode {

    /// Create a new instance of NormalMode
    pub fn new() -> NormalMode {
        NormalMode {
            keymap: NormalMode::key_defaults(),
            builder: Builder::new(),
        }
    }

    /// Creates a KeyMap with default NormalMode key bindings
    fn key_defaults() -> KeyMap<Command> {
        let mut keymap = KeyMap::new();

        keymap.bind_key(Key::Char('u'), Command::undo());
        keymap.bind_key(Key::Ctrl('r'), Command::redo());
        keymap.bind_key(Key::Char('i'), Command::set_mode(ModeType::Insert));

        keymap
    }

    fn check_keymap(&mut self, key: Key) -> BuilderEvent {
        if let KeyMapState::Match(c) = self.keymap.check_key(key) {
            BuilderEvent::Complete(c)
        } else {
            BuilderEvent::Incomplete
        }
    }

}

impl Mode for NormalMode {
    fn handle_key_event(&mut self, key: Key) -> BuilderEvent {
        match self.builder.check_key(key) {
            // builder gives us a full command, return that
            BuilderEvent::Complete(cmd) => BuilderEvent::Complete(cmd),

            // no command from the builder, check the internal keymap
            BuilderEvent::Incomplete => { self.check_keymap(key) }

            // invalid result from builder, return invalid if the internal
            // keymap doesn't give a match
            BuilderEvent::Invalid => {
                let val = self.check_keymap(key);

                if let BuilderEvent::Incomplete = val {
                    BuilderEvent::Invalid 
                } else {
                    val
                }
            }
        }
    }
}